共 4 条
[1]
COTTON DB, 1980, MANUAL OBSTETRICS, P356
[2]
Fox H., 1972, OBSTET GYNECOL SURV, V27, P475
[3]
GOLAN A, 1977, S AFR MED J, V52, P1333
[4]
PRITCHARD JA, 1980, WILLIAMS OBSTETRICS, P883